US$ falls against yen after missile strike

The US dollar is falling after President US Donald Trump approved a missile strike on a Syrian airbase.

The US dollar is falling after President US Donald Trump approved a missile strike on Syria. (AAP)

The US dollar slipped against the safe-haven Japanese yen on Friday, after a US launch of cruise missiles at an airbase in Syria.

A US official said the strike has already been completed.

The US dollar erased its early modest gains and slipped 0.3 per cent to 110.46 yen, compared with a session high of 110.99.

US President Donald Trump said on Thursday that "something should happen" with Syrian President Bashar al-Assad after a deadly poison gas attack in that country.